Method for preparing baking-free load-bearing tile by curing desulfurization waste residues with semidry process at normal temperature

Abstract

The invention belongs to the technical field of environmental engineering and preparation of building materials, and particularly relates to a method for preparing a baking-free load-bearing tile by curing desulfurization waste residues with a semidry process at the normal temperature. The method comprises the following steps of: preparing semidry process desulfurization residues and multicomponent powder into a gelling agent; uniformly mixing with inert sandy aggregate in a mixer; adding water in an appropriate water-ash ratio to a semidry state; and curing a tile blank obtained by performing light press molding and demolding at the normal temperature for 7-28 days to obtain the baking-free load-bearing tile which can meet corresponding strength requirements of MU10 and MU20 load-bearingtiles respectively, has high water resistance and can be taken as an outer wall tile. According to the method, the problem of difficulty in comprehensively utilizing due to complex ingredients of semidry process desulfurization residues is solved, and the baking-free tile of which the cost is lower than that of the conventional sintered clay tile is produced by effectively using solid waste; and the method plays an important role in saving energy, reducing emission and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering and preparation of building materials, and in particular relates to a method for preparing fire-free load-bearing bricks by using semi-dry desulfurization waste residues for normal temperature curing. Background technique [0002] Desulfurization and purification of coal-fired flue gas before discharge into the atmosphere is a rapidly developing environmental protection technology at home and abroad. It has been widely used in various major industrial fields. When lime or slaked lime is used as the desulfurization medium, a large amount of desulfurization gypsum will be produced. Early desulfurization technologies were mainly wet and dry. Wet desulfurization produced a large amount of sludge-like desulfurization gypsum, while dry desulfurization products were generally discharged together with fly ash or slag, and desulfurization gypsum would not be discharged separatel...

AI Technical Summary

Problems solved by technology

However, this kind of mortar also has the following problems: ① its early strength is low, which limits its application; ② the amount of desulfurization slag in the mortar is too low, which makes the cost of this kind of dry-mixed mortar relatively high, and It is not conducive to the large-scale treatment and utilization of desulfurization slag; ③The long-term durability of this kind of construction mortar has not been verified. Experiments show that due to the influence of delayed formation of ettringite, its long-term strength may be seriously reduced or even cracked due to expansion. The risk of its application cannot be ignored

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